CN116113389A

CN116113389A - Disposable wearing article

Info

Publication number: CN116113389A
Application number: CN202180057816.6A
Authority: CN
Inventors: 森谷晶绘
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 2020-09-25
Filing date: 2021-08-20
Publication date: 2023-05-12
Also published as: US20230404820A1; WO2022064918A1; KR20230073174A; TW202211888A; EP4190290A1; JP7345449B2; JP2022054087A

Abstract

The effect of the hydrophilic agent liquid applied to the top sheet is improved. The above object is achieved by a disposable wearing article comprising: a topsheet (30) comprising a skin contact area in contact with the skin of a wearer; and a back side member adjacent to the back side of the top sheet (30), wherein a hydrophilic agent liquid is applied to the skin contact area, the top sheet (30) is pressed from the back side to the front side by embossing, a concave portion (20) is formed at a distance from the back side of the agent liquid containing area (32) of the top sheet (30), the concave portion (20) is formed between the top sheet (30) as the upper surface and the back side member, and the contact area between the top sheet (30) to which the hydrophilic agent liquid is applied and the back side member is reduced due to the existence of the concave portion (20).

Description

Disposable wearing article

Technical Field

The present invention relates to disposable wearing articles such as disposable diapers and sanitary napkins.

Background

In disposable wearing articles, particularly disposable diapers, roughening of the skin of the wearer, particularly rashes, is often a problem. As the main causes thereof, there are physical irritation (friction, hardness, excrement) to the skin of the wearer and skin dryness.

As a method for solving such a problem, the following method has been proposed: a liquid-agent coating which is semi-solid or solid at 20 ℃ and can be partially transferred to the skin of the wearer is applied to a liquid-permeable top sheet, and the liquid-agent transferred to the skin of the wearer forms a barrier, so that excrement is easily removed (see patent document 1).

In addition, the following methods are also known: a hydrophilic agent liquid is applied to a top sheet made of nonwoven fabric to reduce friction and the like (see patent document 2). The hydrophilic agent liquid is preferable in that the hardness of the wax-like substance can be reduced and the deterioration of liquid permeability can be prevented. Particularly, a hydrophilic agent liquid containing water is preferable for preventing skin dryness.

However, when a hydrophilic agent liquid containing water is used for a top sheet made of a staple fiber nonwoven fabric, there is a problem that the effect is not as expected to be increased.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2010-75733

Patent document 2: japanese patent application laid-open No. 2010-526630

Patent document 3: japanese patent laid-open publication 2016-096926

Disclosure of Invention

Problems to be solved by the invention

Therefore, a main object of the present invention is to improve the effect and the like in the case of applying a hydrophilic agent liquid to a top sheet.

Means for solving the problems

The present inventors have found the following findings in the course of examining a topsheet comprising a nonwoven fabric containing a hydrophilic agent liquid (the hydrophilic agent liquid contains water). Namely, consider that: when a hydrophilic agent liquid containing water is applied to a top sheet made of a staple fiber nonwoven fabric, the hydrophilic agent liquid is easily transferred to a member disposed on the back side of the top sheet after production, and the hydrophilic agent liquid is difficult to hold on the top sheet as intended, so that the effect caused by the hydrophilic agent liquid is lower than intended. The disposable wearing article described below is based on this finding.

< mode 1 >

A disposable wearing article, comprising: a topsheet comprising a skin contact area in contact with the skin of a wearer; and a back side member adjacent to the back side of the top sheet, wherein the top sheet is a nonwoven fabric having liquid permeability, the skin contact area has an agent-containing liquid area containing a hydrophilic agent liquid containing water, recessed portions recessed toward the front side are arranged at intervals on the back side of the top sheet, a gap is provided between the upper surface of the recessed portion and the back side member, and the agent-containing liquid area has a portion overlapping the recessed portions.

(effects of action)

In the disposable wearing article, the back surface of the liquid containing region of the top sheet is provided with the concave portions which are concave toward the front surface side at intervals, and the upper surface of these concave portions and the back surface side member are provided with the gaps therebetween, and the liquid containing region has a portion overlapping the concave portions, so that the contact area between the top sheet and the back surface side member is reduced, and the hydrophilic liquid applied to the top sheet is less likely to be transferred to the back surface side member and is likely to remain on the top sheet. This can improve the effect of the hydrophilic agent liquid applied to the top sheet as compared with the conventional one. In other words, the amount of hydrophilic agent to be applied can be reduced while achieving the same effect.

< mode 2 >

The disposable wearing article according to claim 1, wherein the liquid containing region has a dimension in the front-back direction of 30mm or more and a dimension in the width direction of 5mm or more, and the recessed portion has a dimension in the front-back direction of 3mm to 8mm and a dimension in the width direction of 3mm to 5mm, and is arranged in the entire skin contact region of the top sheet at intervals in the front-back direction shorter than the dimension in the front-back direction of the liquid containing region and at intervals in the width direction shorter than the dimension in the width direction of the liquid containing region.

(effects of action)

The size of the solution-containing region and the size and arrangement of the recessed portions may be appropriately determined, but if the solution-containing region is within the scope of the present embodiment, the solution-containing region can reliably have a portion overlapping the recessed portions even if the position of the solution-containing region is slightly changed due to manufacturing errors or the like, and is therefore preferable.

< mode 3 >

The disposable wearing article according to any one of

aspects

1 and 2, wherein the top sheet has a fineness of 1dtex to 3dtex and a weight per unit area of 10g/m ² ～30g/m ² And a staple fiber nonwoven fabric having a thickness of 0.4mm to 1.4mm, wherein the concave portion is formed on the back surface of the top sheet and the convex portion protruding along the inner surface of the concave portion is formed on the front surface of the top sheet by embossing the top sheet by pressing from the back surface side to the front surface side, and a concave portion is formed between adjacent convex portions on the front surface of the top sheet.

(effects of action)

The back surface of the top sheet may have a concave portion, and the front surface of the top sheet may be flat without irregularities, but in order to achieve breathability of the front surface of the top sheet and to reduce surface friction, it is preferable that the front surface of the top sheet has irregularities. In this case, if the concave portion on the back surface of the top sheet and the convex portion on the front surface of the top sheet are formed by embossing as in the present embodiment, the convex portion that is likely to come into contact with the skin is preferably highly retained in the hydrophilic agent liquid.

In addition, in the case where such embossing is performed on the top sheet, if the top sheet is a staple fiber nonwoven fabric as in the present embodiment, the concave portions and the convex portions can be formed more clearly, which is preferable. In addition, in the combination of the hydrophilic agent liquid and the topsheet of the staple fiber nonwoven fabric as in the present embodiment, if a nonwoven fabric having fine fibers is used, the retention of the hydrophilic agent liquid is improved, and therefore, it is preferable.

< mode 4 >

The disposable wearing article according to any one of aspects 1 to 3, wherein the depth of the recessed portion is 0.5mm to 3mm, the dimension of the recessed portion in the front-rear direction is longer than the shortest interval between the recessed portions adjacent in the front-rear direction, and the dimension of the recessed portion in the width direction is longer than the shortest interval between the recessed portions adjacent in the width direction.

(effects of action)

The depth and size of the recessed portion can be appropriately determined, but in this embodiment, the area ratio of the recessed portion is sufficiently higher than that of the portion other than the recessed portion, so that the topsheet has more excellent retention of the hydrophilic agent liquid.

< mode 5 >

The disposable wearing article according to any one of aspects 1 to 4, wherein the hydrophilic agent liquid contains 70 to 90% by weight of glycerin and 10 to 30% by weight of water, and the content of the hydrophilic agent liquid per unit area in the agent-containing liquid region is 5g/m ² ～15g/m ² 。

(effects of action)

The composition of the hydrophilic agent liquid and the agent liquid content in the agent-containing liquid region may be appropriately determined, but are preferably within the scope of the present embodiment.

< mode 6 >

The disposable wearing article according to any one of aspects 1 to 5, wherein the hydrophilic agent liquid has a viscosity of 150mpa·s to 400mpa·s at a temperature of 20 ℃.

(effects of action)

The nonwoven fabric using the fibers of the hydrophobic resin is preferable as the top sheet because it is low in cost, but in this state, the retention of the hydrophilic agent liquid containing water is not sufficient. Accordingly, it is preferable to increase the retention of the hydrophilic agent liquid by the nonwoven fabric by setting the viscosity of the hydrophilic agent liquid within the range of the present embodiment.

< mode 7 >

The disposable wearing article according to any one of aspects 1 to 6, wherein the nonwoven fabric is a nonwoven fabric of hydrophilic fibers obtained by coating hydrophilic agents on fibers of a hydrophobic resin.

(effects of action)

The nonwoven fabric using the fibers of the hydrophobic resin is preferable as the top sheet because it is low in cost, but in this state, the retention of the hydrophilic agent liquid containing water is not sufficient. Therefore, in this case, it is preferable to use a nonwoven fabric using hydrophilic fibers obtained by using a hydrophilic agent, and to improve the retention of the hydrophilic agent liquid by the nonwoven fabric.

Effects of the invention

According to the present invention, there are advantages such as improving the effect when a hydrophilic agent liquid is applied to the top sheet.

Drawings

Fig. 1 is a plan view showing an inner surface of a tape type disposable diaper in an unfolded state.

Fig. 2 is a plan view showing an outer surface of the tape type disposable diaper in an unfolded state.

Fig. 3 is a cross-sectional view taken along line 6-6 of fig. 1.

Fig. 4 is a cross-sectional view taken along line 7-7 of fig. 1.

In fig. 5, (a) is a sectional view taken along line 8-8 of fig. 1, (b) is a sectional view taken along line 9-9 of fig. 1, and (c) is a sectional view taken along line 10-10 of fig. 1.

Fig. 6 is a top view of the topsheet and the auxiliary sheet.

Fig. 7 is a cross-sectional view of the topsheet and the auxiliary sheet.

Fig. 8 is a sectional view taken along line 1-1 of fig. 10 (b), a section taken along line 2-2 of fig. 10 (b), and a section taken along line 3-3 of fig. 10 (b).

Fig. 9 is an enlarged plan view of the bonding pattern of the top sheet bonding portion.

Fig. 10 is an enlarged plan view of the bonding pattern of the top sheet bonding portion.

Fig. 11 is a plan view showing an inner surface of the tape type disposable diaper in an unfolded state.

Fig. 12 is a plan view showing an inner surface of the tape type disposable diaper in an unfolded state.

Fig. 13 is a plan view for explaining a sample.

Detailed Description

Fig. 1 to 5 show a tape type disposable diaper as an example of a disposable wearing article. In the figure, reference symbol X denotes the full width of the diaper except the connecting band, and reference symbol L denotes the full length of the diaper. The dotted line portion in the cross-sectional view represents an adhesive as a joining means for joining the constituent members. The hot-melt adhesive may be applied by a known method such as slit coating, continuous linear or dot-line droplet coating, spiral, Z-shaped, wavy, or the like spraying, or pattern coating (transfer of the hot-melt adhesive by a relief system). In the fixing portion of the elastic member, a hot melt adhesive may be applied to the outer peripheral surface of the elastic member instead of or in combination with these methods to fix the elastic member to the adjacent member. Examples of the hot melt adhesive include EVA adhesives, adhesive rubber adhesives (elastic adhesives), olefin adhesives, polyester adhesives, polyamide adhesives, and the like, and the hot melt adhesive is not particularly limited. As a joining means for joining the constituent members, a means based on material welding such as heat sealing or ultrasonic sealing may be used.

In the following description, a known nonwoven fabric may be used as appropriate depending on the location and purpose. As constituent fibers of the nonwoven fabric, for example, synthetic fibers (including composite fibers such as core and sheath in addition to single component fibers) such as olefin fibers, polyester fibers, and polyamide fibers such as polyethylene and polypropylene, regenerated fibers such as rayon and cuprammonium fibers, natural fibers such as cotton, and the like may be selected without particular limitation, and these fibers may be mixed and used. In order to improve the softness of the nonwoven fabric, crimped fibers are preferably used as constituent fibers. The constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers having hydrophilicity by a hydrophilic agent), or may be hydrophobic fibers or water-repellent fibers (including fibers having water repellency by a water repellent agent). Further, nonwoven fabrics are generally classified into short fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlaced nonwoven fabrics, hot-rolled (hot air) nonwoven fabrics, needle punched nonwoven fabrics, point bonded nonwoven fabrics, laminated nonwoven fabrics (SMS nonwoven fabrics, SMMS nonwoven fabrics, etc. having different nonwoven layers laminated together with a meltblown layer interposed between spunbond layers, in addition to SSS nonwoven fabrics, etc. obtained by laminating the same or similar nonwoven layers) and the like according to the lengths of the fibers, sheet forming methods, fiber bonding methods, and laminated structures, and any nonwoven fabrics of these may be used. The laminated nonwoven fabric is a nonwoven fabric produced as a single nonwoven fabric including all layers and subjected to a fiber bonding process throughout all layers, and does not include a nonwoven fabric obtained by bonding a plurality of nonwoven fabrics produced by each other by a bonding means such as a hot melt adhesive.

The present tape type disposable diaper comprises: a ventral portion F extending forward from the center in the front-rear direction LD; and a back side portion B extending from the center to the rear side in the front-rear direction LD. The present tape type disposable diaper has a shape including: a crotch portion M extending from a position on the front side of the center in the front-rear direction of the product to a position on the rear side of the center in the front-rear direction of the product; front wings 80 protruding to left and right sides at positions apart from the front side of the center in the front-rear direction of the product; and rear wings 81 protruding to the left and right sides at positions apart from the center in the front-rear direction of the product toward the rear side. The present tape type disposable diaper further comprises: an absorber 56 which is incorporated in a range including the crotch portion; a liquid-permeable top sheet 30 covering the front surface side of the absorber 56; a liquid-impermeable sheet 11 covering the back surface side of the absorber 56; and an exterior nonwoven fabric 12 covering the back surface side of the liquid-impermeable sheet 11 and constituting the outer surface of the product.

The materials and characteristic portions of each portion are described below in order.

(absorber)

The absorber 56 is a portion that absorbs and retains excreted liquid, and may be formed of an aggregate of fibers. As the fiber aggregate, a filament aggregate obtained by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate, if necessary, may be used in addition to a fiber aggregate obtained by integrating short fibers such as cotton pulp or synthetic fibers. As unit area of fibres Weight, for example, in the case of cotton pulp or staple fiber, may be about 100g/m ² ～300g/m ² In the case of filament aggregates, for example, it may be about 30g/m ² ～120g/m ² . The fineness of the synthetic fiber is, for example, 1dtex to 16dtex, preferably 1dtex to 10dtex, and more preferably 1dtex to 5dtex.

The planar shape of the absorber 56 may be appropriately determined, or may be a shape that narrows along the leg-surrounding area in the middle of the front-rear direction LD, in addition to a rectangle. In fig. 1, the absorber 56 is provided, but the absorbent article of the present invention may not be provided.

(superabsorbent Polymer particles)

A portion or all of the absorbent body 56 may be made to contain superabsorbent polymer particles. The superabsorbent polymer particles also include "powders" in addition to "particles". As the superabsorbent polymer particles, superabsorbent polymer particles used in such absorbent articles can be directly used. The particle diameter of the superabsorbent polymer particles is not particularly limited, but is desirably such that: for example, when screening (vibration 5 minutes) using a 500 μm standard sieve (JIS Z8801-1:2006) is performed and screening (vibration 5 minutes) using a 180 μm standard sieve (JIS Z8801-1:2006) is performed on particles falling under the sieve in the screening, the proportion of particles remaining on the 500 μm standard sieve is 30% by weight or less and the proportion of particles remaining on the 180 μm standard sieve is 60% by weight or more.

The material of the superabsorbent polymer particles is not particularly limited, but a material having a water absorption capacity of 40g/g or more is preferable. As the super absorbent polymer particles, there are super absorbent polymer particles such as starch-based, cellulose-based, synthetic polymer-based and the like, and super absorbent polymer particles such as starch-acrylic acid (salt) graft copolymer, saponified product of starch-acrylonitrile copolymer, crosslinked product of sodium carboxymethyl cellulose, acrylic acid (salt) polymer and the like can be used. The shape of the superabsorbent polymer particles is preferably a powder or granule that is generally used, but other shapes may be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too low, so-called backflow in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 easily occurs.

The super absorbent polymer particles preferably have a gel strength of 1000Pa or more. Thus, even when the bulk absorber 56 is used, the sticky feeling after the liquid absorption can be effectively suppressed.

The weight per unit area of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required according to the use of the absorbent body 56. Therefore, although not to be construed as a whole, it may be 50g/m in a usual case ² ～350g/m ² 。

(packaging sheet)

In order to prevent the superabsorbent polymer particles from coming out, or to improve the shape retention of the absorbent body 56, the absorbent body 56 may be built-in as the absorbent member 50 wrapped by the wrapping sheet 58. As the wrapping sheet 58, tissue paper, particularly crepe paper, nonwoven fabric, polyethylene laminated nonwoven fabric, a sheet with small holes, or the like can be used. However, a sheet in which the superabsorbent polymer particles do not come out is preferable. In the case of using nonwoven fabric instead of crepe paper, hydrophilic SMMS (spunbond/meltblown/spunbond) nonwoven fabric is particularly preferable, and polypropylene, polyethylene/polypropylene, and the like can be used as the material. The weight per unit area of the fibers is preferably 5g/m ² ～40g/m ² Particularly preferably 10g/m ² ～30g/m ² 。

In addition to the configuration in which 1 sheet is used to wrap the entire absorber 56 as shown in fig. 3, the packaging sheet 58 may be used to wrap the entire absorber 56 with a plurality of sheets such as 2 sheets up and down. The wrapping sheet 58 may also be omitted.

(Top sheet)

The top sheet 30 extends from the front end to the rear end of the product in the front-rear direction and laterally from the absorber 56 in the width direction WD, but may be appropriately deformed such as having the width of the top sheet 30 shorter than the full width of the absorber 56, if necessary, for example, in the case where the starting point of the standing gathers 60 is located closer to the center side in the width direction WD than the side edges of the absorber 56.

The top sheet 30 has a skin contact area with the skin of the wearer, and is preferably a nonwoven fabric from the viewpoints of liquid permeability and skin touch. Various nonwoven fabrics can be used for the top sheet 30, but in view of cushioning properties, softness, and permeability of soft feces (watery feces or muddy feces), short fiber nonwoven fabrics such as hot air nonwoven fabrics are preferable to long fiber (continuous fiber) nonwoven fabrics, and staple fiber nonwoven fabrics having a fineness of 1dtex to 10dtex and a weight per unit area of 10g/m are generally preferable ² ～30g/m ² A staple fiber nonwoven fabric having a thickness of about 0.4mm to 1.4 mm. The fiber length of the staple fiber nonwoven fabric is not particularly limited, but is preferably about 20mm to 100mm.

(middle piece)

In order to allow the liquid having penetrated the top sheet 30 to rapidly transfer to the absorbent body, a hydrophilic intermediate sheet (also referred to as "auxiliary sheet") 40 may be provided. The intermediate sheet 40 serves to rapidly transfer the liquid to the absorber to improve the absorption performance of the absorber, and prevents the "backflow" phenomenon in which the absorbed liquid flows backward from the absorber. The intermediate sheet 40 of the present example corresponds to a back side member adjacent to the back side of the top sheet 30, but the intermediate sheet 40 may be omitted, and in this case, the package sheet 58 is a back side member, and in the case where the package sheet 58 is omitted, the absorber 56 is a back side member.

As the intermediate sheet 40, a liquid-permeable sheet such as nonwoven fabric can be used. As the intermediate sheet 40, a hot air nonwoven fabric is particularly preferable because the hot air nonwoven fabric is fluffy. The hot air nonwoven fabric preferably uses a composite fiber having a core-sheath structure, and in this case, the resin used for the core may be polypropylene (PP), but is preferably Polyester (PET) having high rigidity. In the case of using such a nonwoven fabric of hydrophobic synthetic fibers, the nonwoven fabric can be made hydrophilic by using a known hydrophilic agent. The weight per unit area of the nonwoven fabric is preferably 17g/m ² ～80g/m ² More preferably 18g/m ² ～60g/m ² . The thickness of the material fibers of the nonwoven fabric is preferably 2.0dtex to 10dtex. To change the non-woven fabricFluffy, it is preferable to use a core-spun fiber, a hollow fiber, or a mixed fiber in which the core is not centered, or a core-spun and hollow fiber is used as all or part of the material fiber.

The middle sheet 40 in the example shown in the figure is shorter than the width of the absorber 56 and is disposed in the center, but may be disposed over the entire width. The intermediate sheet 40 may be provided over the entire length of the diaper, but may be provided only in the middle portion including the excretion position in the front-rear direction LD as shown in the illustrated example.

(liquid-impermeable sheet)

The liquid-impermeable sheet 11 is not particularly limited, but preferably has moisture permeability. As the liquid-impermeable sheet 11, for example, a microporous sheet obtained by the following method can be preferably used: an olefin resin such as polyethylene or polypropylene is mixed with an inorganic filler, and the resulting mixture is molded into a sheet, and then stretched in a uniaxial or biaxial direction. As the liquid-impermeable sheet 11, a material having a nonwoven fabric as a base material and having improved water repellency can be used.

The liquid-impermeable sheet 11 preferably extends over the same range as the absorber 56 or over a wider range in the front-rear direction LD and the width direction WD, but in the case where other water blocking means are present, etc., a structure may be employed in which the ends of the absorber 56 are not covered in the front-rear direction LD and the width direction WD as needed.

(exterior nonwoven fabrics)

The exterior nonwoven fabric 12 covers the entire back surface side of the liquid-impermeable sheet 11, and gives the outer surface of the product a cloth-like appearance. The weight per unit area of the fibers of the exterior nonwoven fabric 12 is preferably 10g/m ² ～50g/m ² Particularly preferably 15g/m ² ～30g/m ² But is not limited thereto. The outer nonwoven fabric 12 may be omitted, and in this case, the liquid-impermeable sheet 11 may be extended to the side edges of the product.

(standing gathers)

In order to prevent excrement from moving laterally on the top sheet 30 and to prevent so-called side leakage, it is preferable that standing gathers 60 standing up toward the skin side of the wearer are provided on both sides in the width direction WD of the front face. Of course, the standing gathers 60 may be omitted.

In the case of using the standing gathers 60, the structure of the standing gathers 60 is not particularly limited, and any known structure may be used. The standing gather 60 of the illustrated example is composed of the following portions: a gather sheet 62 that is substantially continuous in the width direction WD; and an elongated gather elastic member 63 fixed to the gather sheet 62 in an elongated state along the front-rear direction LD. As the gather sheet 62, a water-repellent nonwoven fabric may be used, and as the gather elastic member 63, a rubber thread or the like may be used. In addition to providing a plurality of elastic members on each side as shown in fig. 1 and 2, only 1 elastic member may be provided on each side.

The inner surface of the gather sheet 62 has a joining start end in the width direction WD on the side portion of the top sheet 30, and a portion extending outward in the width direction from the joining start end is joined to the inner surface of each side flap SF, that is, the side portion of the liquid-impermeable sheet 11 and the side portion of the exterior nonwoven fabric 12 located outward in the width direction in the example shown in the figure, by means of a hot-melt adhesive or the like.

At the leg periphery, the portion of the standing gather 60 on the widthwise center side of the joining start end is fixed to the top sheet 30 at both end portions in the product front-rear direction, but the portion therebetween is a free portion that is not fixed, and the free portion stands up by the contraction force of the elastic member 63, thereby being in close contact with the body surface.

(end wing, side wing)

The tape type disposable diaper illustrated in the figure comprises: a pair of end flaps EF extending toward the front and rear sides of the absorber 56, respectively, and having no absorber 56; and a pair of side wings SF that extend to the side of the side edges of both sides of the absorber 56, respectively, and do not have the absorber 56. The side flaps SF may be formed of a main body sheet (the exterior nonwoven fabric 12 or the like) continuous from the portion having the absorber 56 as shown in the illustrated example, or may be formed by attaching other materials.

(planar pleats)

The side elastic members 64 made of an elongated elastic member such as rubber threads are fixed to the side flaps SF in an elongated state in the front-rear direction LD, whereby leg-surrounding portions of the side flaps SF are configured as planar gathers. The side elastic member 64 may be provided between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 at the side flaps SF, in addition to being provided between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction near the joining start end in the joining portion of the gather sheet 62 as in the illustrated example. In addition to the plurality of side elastic members 64 provided on each side as in the illustrated example, only 1 side elastic member may be provided. Of course, the side elastic member 64 (planar pleats) may be omitted.

The planar gather is a portion where the contraction force of the side elastic member 64 acts (a portion of the side elastic member 64 is illustrated in the figure). Accordingly, the following structure is included in addition to the form in which the side elastic member 64 is present only in the flat gather portion: the side elastic members 64 are present at the front side, the rear side, or both sides of the planar gather, but the side elastic members are finely cut at one or more places other than the portion of the planar gather, or are not fixed to the sheet sandwiching the side elastic members 64, or both, whereby the contraction force does not act at the portion other than the planar gather (substantially equivalent to the absence of the elastic members), and the contraction force of the side elastic members 64 acts only at the portion of the planar gather.

(front wing)

The present tape type disposable diaper has front flaps 80 protruding to the left and right sides at positions apart from the front side in the center in the front-rear direction of the product. The front wing (i.e., the shape in which the width does not change from the narrowest part of the product to the front end of the product) may be omitted.

The dimension of the front wing 80 in the width direction WD may be appropriately determined, and may be, for example, 5% to 20% (particularly, 7% to 15%) of the total length L of the article. The dimension in the width direction WD of the front wing 80 may be substantially the same as the dimension in the width direction WD of the rear wing 81 described later.

(rear wing)

The present tape type disposable diaper has rear flaps 81 protruding to the left and right sides at positions apart from the center in the front-rear direction of the product to the rear side.

The dimension of the rear wing 81 in the width direction WD may be appropriately determined, and may be smaller or larger than the dimension of the front wing 80 in the width direction, in addition to being the same as the dimension of the front wing 80 in the width direction.

(middle part)

The side edges 15 of the product in both sides between the front wing 80 and the rear wing 81 may have, for example, substantially linear portions as follows: the width range of + -5 mm extends in the direction perpendicular to the center, centering on the direction in which the acute angle side crossing angle with respect to the front-rear direction LD is smaller than + -2 degrees. The side edges 15 of the product between the front wing 80 and the rear wing 81 may be wavy or curved (not shown), or may be straight as in the illustrated example.

(formation of wings)

As in the illustrated example, by cutting the side portions of the side wings SF into concave shapes, it is possible to form concave edges that reach the entire lower edge of the rear wing 81 from the lower edge of the front wing 80 via the side edges 15 of the product between the front wing 80 and the rear wing 81. In this case, the laminated structure of the front flap 80 and the rear flap 81 is determined by the laminated structure of the side flaps SF, and in the illustrated example, the front flap 80 and the rear flap 81 are formed by the gather sheet 62 and the exterior nonwoven fabric 12. Although not shown, a front extension piece protruding laterally from the side wing SF may be provided, and the front extension piece may form a part of the front wing 80 on the entire or distal end side. Similarly, a rear extension piece protruding laterally from the side wing SF may be provided, and the rear extension piece may form a part of the rear flap 81 on the entire or distal end side. As the front extension sheet and the rear extension sheet, various nonwoven fabrics can be used.

(connecting portion)

The rear flap 81 has a connecting portion 13A detachably connected to the abdominal portion F when worn. That is, when worn, both side portions of the rear flap 81 are wound around the abdomen of the wearer, and the connecting portion 13A of the rear flap 81 is connected to the outer surface of the abdomen portion F. As the coupling portion 13A, an adhesive layer may be provided in addition to a hook (male member) of a mechanical fastener (face fastener). The hook member has a plurality of engaging protrusions on its coupling surface, and as the shape of the engaging protrusions, any known shape such as a rude shape, a J shape, a mushroom shape, a T shape, a double J shape (a shape obtained by coupling J-shaped members back to back) can be used.

The connecting portion 13A may be directly attached to the rear wing 81, or the connecting belt 13 having the connecting portion 13A may be attached to the rear wing 81 as in the illustrated example. The structure of the connecting belt 13 is not particularly limited, and in the illustrated example, the connecting belt 13 includes a belt attachment portion 13C fixed to the side wing SF, a belt main body portion 13B protruding from the belt attachment portion 13C, and a connecting portion 13A provided in a widthwise WD intermediate portion of the belt main body portion 13B, and a portion on the distal end side of the connecting portion 13A is a pinching portion. As the sheet formed from the belt mounting portion 13C to the belt main body portion 13B, nonwoven fabric, plastic film, polyethylene laminated nonwoven fabric, paper, or a composite material thereof can be used.

The connection portion of the connection portion 13A on the outer surface of the ventral portion F may be appropriately determined, and only the main body portion located between the left and right front wings 80 may be set as the connection portion, or a range from the side portion of the main body portion to the base end side of the front wings 80 may be set as the connection portion. These connection portions are preferably provided to facilitate connection of the connection portion 13A, and a target 24 having a target portion for facilitating connection may be provided. For example, in the case where the joining portion 13A is a hook (male member) of a mechanical fastener (surface fastener), a ring surface (female member) of the mechanical fastener or a nonwoven fabric may be used to form a joining portion on the outer surface of the abdominal portion F. As the torus, a torus obtained by sewing a loop on a plastic film is also known, but from the viewpoint of breathability and softness, a long fiber nonwoven fabric having a continuous fiber direction WD in a width direction (fineness of 2.0 dtex to 4.0dtex, weight per unit area of 20g/m is preferable ² ～50g/m ² A spun-bonded nonwoven fabric having a thickness of about 0.3mm to 0.5mm, etc.), a welded portion obtained by welding fibers to each other is provided intermittently at least in the width direction WD. In the case where the region including the joining portion on the outer surface of the abdominal portion F is formed of the exterior nonwoven fabric 12 as in the illustrated example, the hook material can be joined to the exterior nonwoven fabric 12 without any additional attachment. If desired, the torus may be attached only to the junction on the outer surface of the ventral portion F. In addition, in the case where the connecting portion 13A is an adhesive material layer, a plastic film having a smooth surface and rich in adhesiveness may be adhered to the abdomen The junction on the outer surface of the side portion F.

(fixing of topsheet)

The top sheet 30 is preferably bonded to a back side member disposed on the back side of the top sheet 30 via a hydrophobic hot melt adhesive 29. Alternatively or in combination with this method, the top sheet 30 may be bonded to the back side member disposed on the back side thereof by welding at least one of the top sheet 30 and the back side member disposed on the back side thereof. The fixing region of the top sheet 30 may extend over the entire top sheet 30, or may be only a region contacting the top sheet 30 except the concave portion 20. In the illustrated example, the back side member is the intermediate sheet 40, the packaging sheet 58, and the liquid-impermeable sheet 11, but is not limited thereto.

As the hydrophobic hot melt adhesive 29, EVA-based, olefin-based, polyester-based, polyamide-based, and the like can be used, and an adhesive rubber-based (elastic system) is particularly preferably used.

The amount of the hydrophobic hot melt adhesive 29 to be applied may be appropriately determined, but in a usual case, may be about 0.1g/m ² ～10g/m ² . In particular, if the application amount of the hydrophobic hot melt adhesive 29 is about 0.5g/m ² ～5g/m ² It is preferable to use the combination of the design of the coating pattern of the hydrophilic agent liquid and the like because the overflow of the hot-melt adhesive 29 into the concave portion 20 can be suppressed, but adhesion inhibition by the hydrophilic agent liquid described later is easily generated. The coating pattern of the hydrophobic hot-melt adhesive 29 may be appropriately determined, and a dense pattern (spiral, Z-shaped, wavy, etc. spray coating) in which minute non-coated portions are dispersed is desirable, but may be a continuous planar coating pattern such as slit coating.

(solution containing region)

As shown in fig. 7, 11 and 12, the skin contact area of the top sheet 30 has a liquid-containing area 32 containing a hydrophilic agent liquid containing water. If the size of the liquid containing region is too small, the friction reducing effect is local and the meaning of protecting the skin of the wearer is small, so that the liquid containing region 32 preferably has a dimension 32L in the MD direction (in the illustrated example, the front-rear direction LD) of 30mm or more and a dimension 32W in the CD direction (in the illustrated example, the width direction WD) of 5mm or more. The dimension 32L of the liquid-containing region 32 in the MD direction is more preferably 50mm or more, and particularly preferably 100mm or more. The upper limit of the dimension 32L in the MD direction of the liquid-containing region 32 is the entire product length L, but may be shorter than this. The dimension 32W in the CD direction of the solution containing region 32 is more preferably 10mm or more. The upper limit of the CD-direction dimension 32W of the liquid-containing region 32 is the width-direction WD of the top sheet 30, but may be shorter than this.

The liquid-containing region 32 may be provided at only one position or at a plurality of positions with a large area to some extent. The liquid containing region 32 is preferably provided in a vertically striped manner as in the illustrated example, but may be provided in a horizontally striped manner. In these cases, the interval 32X between adjacent liquid-containing regions 32 may be appropriately determined, but is preferably, for example, about 1.5mm to 10mm.

Further, as the nonwoven fabric of the top sheet 30, a nonwoven fabric having a fineness of 1dtex to 3dtex (more preferably 1.5dtex to 2.5 dtex) and a weight per unit area of 10g/m is preferably used ² ～30g/m ² (more preferably 15 g/m) ² ～25g/m ² ) A staple fiber nonwoven fabric having a thickness of 0.4mm to 1.4mm (more preferably 0.5mm to 1.0 mm). That is, the thickness of the fibers of the staple fiber nonwoven fabric contributes to the reduction of the friction on the surface, and the friction reduction effect achieved by the hydrophilic agent liquid is combined with the reduction effect of the friction, thereby improving the overall friction reduction effect. Further, since the fibers are fine, the retention of the hydrophilic agent liquid is also improved, and thus the friction reducing effect can be also improved. More specifically, the average friction coefficient MIU of the solution-containing region in the top sheet 30 is preferably 0.2 to 0.4 by the combination of the above-described staple fiber nonwoven fabric and the hydrophilic agent solution.

The surface water fraction of the liquid containing region 32 is not particularly limited, but is preferably 3% to 10%, particularly 4% to 8%, because the skin of the wearer can be suitably moistened to prevent dryness.

The hydrophilic agent liquid may contain water, and the composition of components other than water is not particularly limited. For example, as the component other than water of the hydrophilic agent liquid, one or more of the following components may be selected: glycerol, propylene glycol, dipropylene glycol, 1, 3-butanediol, polyethylene glycol, sorbitol, xylitol, sodium pyrrolidone carboxylate, saccharides such as trehalose, glycosaminoglycans (e.g., hyaluronic acid and its derivatives, chondroitin sulfate and its derivatives, heparin and its derivatives, etc.), elastin and its derivatives, collagen and its derivatives, NMF-related substances, lactic acid, urea, higher fatty acid octyldodecyl ester, seaweed extract, violaxanthin (bletilla striata) extract, various amino acids and its derivatives, etc. In addition, as the additive, one or more additives selected from the group consisting of an emulsifier, a phosphate ester, paraffin wax, and a surfactant may be contained. The surfactant is preferably an ether type nonionic surfactant or an EO/PO type nonionic surfactant. The hydrophilic agent liquid may contain a preservative in order to improve the storage stability of the product, but is preferably not contained because the hydrophilic agent liquid is transferred to the skin to wet the skin.

Particularly preferred hydrophilic agent solutions contain 70 to 90 wt% glycerol and 10 to 30 wt% water. The hydrophilic agent liquid mainly composed of glycerin and containing an appropriate amount of water is preferable not only as a humectant in transferring to the skin, but also because water is retained in glycerin as bound water (the retention of glycerin to water is extremely high) and is not easily spoiled. That is, from such a viewpoint, in the case of using a hydrophilic agent liquid containing water, if a large amount of glycerin is contained in the hydrophilic agent liquid, the surface moisture content (for example, 3% to 10% as described above) is sufficiently ensured, and the water activity value of the hydrophilic agent liquid is suppressed to be low, for example, 0.8 or less, more preferably 0.3 to 0.7, and particularly preferably 0.3 to 0.5, microbial growth can be suppressed even if a preservative is not contained, and the storage property is good, and the moisturizing effect when transferred to the skin is also high.

The content of the hydrophilic agent liquid in the agent-containing liquid region 32 may be appropriately determined according to the purpose. For example, in the case of a hydrophilic agent liquid containing 70 to 90 wt% of glycerin and 10 to 30 wt% of water, the content per unit area in the agent-containing liquid region 32 is preferably 5g/m ² ～15g/m ² . At the position ofIn the case of having a plurality of regions having different amounts of hydrophilic agent liquid as shown in fig. 12 a and 32b, or in the case of continuously varying the application amount of hydrophilic agent liquid, the content of hydrophilic agent liquid in the entire agent-containing liquid region 32 is preferably 2g/m ² ～20g/m ² Or the content of the hydrophilic agent solution is 5g/m ² ～15g/m ² The portion of (2) is 20% or more of the area of the liquid-containing region 32, or both.

The glycerol content was measured by the following method for measuring glycerol content.

(method for measuring glycerol content)

4 parts of the same product were prepared, and the size of the glycerin-containing region 32 was measured by a method described later with respect to any one of the parts, and the area of the glycerin-containing region 32 (total area when a plurality of glycerin-containing regions were present) was obtained.

All of the glycerin-containing region 32 (as long as the entire glycerin-containing region is not required to be cut out accurately along the edge, the portion around the glycerin-containing region may be slightly contained) is cut out from the top sheet 30 of 4 parts of the same product and all of them are taken as test pieces, or the top sheet 30 of 4 parts of the same product is removed as a test piece.

The test piece was placed in a 300ml beaker containing water at 25 degrees, repeatedly and irregularly poked or stirred with a glass rod for 1 minute or more, and then allowed to stand for 60 minutes in a state where the test piece was immersed in the water. In order to keep the height of the test piece in the beaker as low as possible during the standing, the test piece is folded and pressed with a weight, or is fixed by bonding or sewing in a folded state in advance. The amount of water is the smallest amount (for example, 10 ml) that can immerse the entire test piece in water. After this standing, the test piece was pulled up and sufficiently squeezed after repeatedly and irregularly stirring with a glass rod for 1 minute or more, and the glycerin concentration of the glycerin-containing water remaining in the beaker was measured using a glycerin concentration meter. The weight of the glycerin-containing water remaining in the beaker was measured. Then, the weight of glycerin contained in the glycerin-containing water was determined based on the measurement results.

The glycerin content (g/m) of the glycerin-containing region 32 was calculated by dividing the glycerin weight of the glycerin-containing water by a value of 4 times the area of the glycerin-containing region 32 (for 4 parts of product) ² )。

The topsheet 30 using the fibers of the hydrophobic resin is preferable because the cost of the topsheet 30 is low, but in this state, the retention of the hydrophilic agent liquid containing water is not sufficient. Thus, the hydrophilic agent liquid preferably has a viscosity of 150 mPas to 400 mPas at 20 ℃. Thus, the retention of the hydrophilic agent liquid by the top sheet 30 is preferably improved.

The topsheet 30 using the fibers of the hydrophobic resin is preferable because the cost of the topsheet 30 is low, but in this state, the retention of the hydrophilic agent liquid containing water is not sufficient. Accordingly, a nonwoven fabric of hydrophilic fibers obtained by coating hydrophilic agents on fibers of a hydrophobic resin is preferably used for the top sheet 30. Thus, the retention of the hydrophilic agent liquid by the top sheet 30 is preferably improved.

As the hydrophilic agent, the following individual components or a mixture thereof are preferably used in view of safety to the human body, safety in the process, and the like: nonionic surfactants such as higher alcohols, higher fatty acids, and alkylphenols to which ethylene oxide is added, and anionic surfactants such as alkyl phosphate salts (octyl and dodecyl), and alkyl sulfate salts. The amount to be added varies depending on the desired properties, but is generally preferably about 0.1 to 2.0 wt%, particularly preferably about 0.2 to 1.0 wt% based on the dry weight of the object sheet. In addition, the hydrophilic agent can be used in the middle sheet as well.

(concave portion)

As shown in fig. 6 to 8, the back surface of the top sheet 30 is provided with the concave portions 20 which are concave toward the front surface side at intervals, and a gap is provided between the upper surface of the concave portion 20 and the back surface side member (in the illustrated example, the intermediate sheet 40), and when the liquid containing region 32 has a portion overlapping with the concave portions 20, the contact area between the top sheet 30 and the back surface side member is reduced, and the hydrophilic agent liquid applied to the top sheet 30 is less likely to be transferred to the back surface side member and is likely to remain on the top sheet 30, so that the effect in the case where the hydrophilic agent liquid is applied to the top sheet 30 can be improved as compared with the conventional case. In other words, the amount of hydrophilic agent to be applied can be reduced while achieving the same effect.

The depth 20h of the recess 20 may be appropriately determined, but is preferably 0.5mm to 3mm in a usual case in view of more reliably reducing the contact area between the top sheet 30 and the back surface side member.

The size of the liquid containing region 32 and the size and arrangement of the recessed portions 20 can be appropriately determined, but for example, in the case where the liquid containing region 32 has a size of 30mm or more in the front-rear direction LD and a size of 5mm or more in the width direction WD, if the recessed portions 20 have a size 20q of 3mm to 8mm in the front-rear direction LD and a size 20w of 3mm to 5mm in the width direction WD, and are arranged in the entire skin contact region of the top sheet 30 at intervals of the front-rear direction LD and the width direction WD shorter than the size of the liquid containing region 32, the liquid containing region 32 can reliably have a portion overlapping the recessed portions 20 even if the position of the liquid containing region 32 slightly varies due to manufacturing errors or the like, which is preferable.

In addition, if the dimension 20q of the recess 20 in the front-rear direction LD is longer than the shortest interval 20p of the recess 20 adjacent in the front-rear direction LD (20 q > 20 p) and the dimension 20w of the recess 20 in the width direction WD is longer than the shortest interval 20i of the recess 20 adjacent in the width direction WD (20 w > 20 i), the area ratio of the recess 20 (the proportion of the area of the recess per unit area of the top sheet) is sufficiently higher than that of the portion other than the recess 20, and therefore, the retention of the top sheet 30 to the hydrophilic agent liquid is preferable.

The planar shape of the recess 20 is not particularly limited, and may be any shape such as an ellipse, a triangle, a rectangle, a polygon having five or more sides, a star, or a cloud, other than a circle as in the example of the figure.

The planar arrangement of the concave portions 20 is not particularly limited, and may be appropriately modified such as to be staggered (staggered in adjacent columns) as shown in fig. 6 and 10, in addition to being a determinant as shown in fig. 9.

In the illustrated example, the form in which the concave portion 20 is provided in the substantially entire region of the top sheet 30 is assumed, but the concave portion may be provided only in a part of the top sheet 30 as long as the concave portion has a portion overlapping the liquid containing region 32, and may be provided only in the substantially entire region where the top sheet 30 overlaps the middle sheet 40, for example, when the size of the middle sheet 40 is shorter than that of the top sheet 30.

The back surface of the top sheet 30 may have the concave portion 20, and the front surface of the top sheet 30 may be flat as shown in fig. 7, but in the case where the air permeability and the surface friction reduction of the front surface of the top sheet 30 are to be achieved, it is preferable that the front surface of the top sheet 30 has the concave and convex portions as shown in fig. 6 and fig. 8 to 10. Such irregularities can be formed by embossing. In particular, if the top sheet 30 is pressed from the back side to the front side by embossing as in the illustrated example to form the concave portions 20, the convex portions 31 are formed in an arrangement corresponding to (overlapping) the concave portions 20 on the back side of the top sheet 30 when viewed from the front side of the top sheet 30, and the convex portions 31 which are likely to be in contact with the skin have high retention of the hydrophilic agent liquid, which is preferable. In addition, in the case where such embossing is performed on the top sheet 30, if the top sheet 30 is a staple fiber nonwoven fabric as described above, the concave portions 20 and the convex portions 31 can be formed more clearly, and the retention of the hydrophilic agent liquid is improved, which is preferable. In addition, reference numeral 33 denotes a portion between adjacent convex portions 31, that is, a concave portion in the case of being viewed from the front side.

As an example, as shown in fig. 6 and 8 to 10, it is preferable that the portions between the projections 31 adjacent in the width direction and the front-rear direction (portions between the concave portions 20 when viewed from the rear surface side) in the top sheet 30 are joined to the intermediate sheet 40 by pressure welding, whereby the plurality of top sheet joining portions 82 are formed in a joining pattern intermittent in the width direction and the front-rear direction. The top sheet engaging portion 82 is also a portion forming the bottom of the recess. In the joining pattern between the top sheet 30 and the intermediate sheet 40, in the region between the projections 31 adjacent in the MD direction, the top sheet joining portion 82 is formed in a row in which a plurality of the top sheet joining portions 82 are arranged at intervals in the CD direction so as to intersect the region at the CD-direction center position, and the compressed portion 83 is formed at the CD-direction interval portion of the top sheet joining portion 82, the top sheet 30 and the intermediate sheet 40 are not welded at the compressed portion 83, and the top sheet 30 is compressed more than the both sides in the MD direction thereof. Such a structure can be manufactured by the method described in patent document 3.

In the compression portion 83, the intermediate sheet 40 may be compressed integrally with the top sheet 30 or may not be compressed as long as the top sheet 30 is compressed. In addition, at the portions other than the top sheet joining portion 82 and the compression portion 83, the top sheet 30 and the intermediate sheet 40 may not be welded and compressed similarly to the CD-direction interval portion, but it is preferable that the top sheet 30 and the intermediate sheet 40 not be welded and the compression of the top sheet 30 not exceed the CD-direction interval portion (also including the case of not being compressed at all). That is, when the thickness of the top sheet joining portion 82 of the top sheet 30 is T1, the thickness of the compression portion 83 is T2, and the thickness of the portion other than the top sheet joining portion 82 and the compression portion 83 is T3, T1 < t2=t3 may be used, but T1 < T2 < T3 is preferable.

The shape of each top sheet joint portion 82 is not particularly limited, and may be any shape such as an ellipse, a polygon, a star, a cloud, or the like, in addition to a circle as in the example of the figure.

As shown in fig. 7 (c), the liquid containing region 32 may be provided only in the portion of the top sheet 30 having the concave portion 20. That is, a plurality of the solution containing regions 32 may be provided corresponding to the arrangement of the recessed portions 20. Of course, although not shown, in the case where the convex portions 31 are provided on the front surface of the top sheet 30 in correspondence with the concave portions 20 on the back surface of the top sheet 30 as in the examples shown in fig. 6 and 8 to 10, the liquid containing region 32 may be provided only at the portions having the concave portions 20 in the top sheet 30, that is, only at the convex portions 31.

< description of the words in the specification >

The following terms in the specification have the following meanings unless otherwise specified in the specification.

"front-rear direction" refers to the direction indicated by the symbol LD in the drawing (longitudinal direction), and "width direction" refers to the direction indicated by the symbol WD in the drawing (left-right direction), the front-rear direction being perpendicular to the width direction.

"MD direction" and "CD direction" refer to a conveyance direction (MD direction) in a manufacturing apparatus and a transverse direction (CD direction) perpendicular to the conveyance direction, and either one of them is a front-back direction and the other is a width direction depending on a portion of a product. The MD direction of the nonwoven fabric is the direction in which the fibers of the nonwoven fabric are oriented. The fiber orientation refers to the direction along which the fibers of the nonwoven fabric are oriented, and can be determined by, for example, the following measurement method: a measurement method according to a fiber orientation test method, wherein the fiber orientation test method is a test method based on zero distance tensile strength of TAPPI standard method T481; or a simple measurement method for determining the fiber orientation direction based on the ratio of the tensile strength in the front-back direction and the width direction.

"front side" refers to the side that is closer to the skin of the wearer when worn, and "back side" refers to the side that is farther from the skin of the wearer when worn.

"front" refers to the side that is closest to the wearer's skin when worn, and "back" refers to the side that is furthest from the wearer's skin when worn.

"area ratio" means the ratio of the target portion to the unit area, and is expressed as a percentage by dividing the total area of the target portion (e.g., hole) in the target region (e.g., cover nonwoven fabric) by the area of the target region. In a mode in which a plurality of target portions are provided at intervals, it is preferable to set the target region to a size including 10 or more target portions to obtain the area ratio. For example, the area ratio of the holes can be measured by using a device such as the product name VHX-1000 of KEYENCE, and the measurement conditions are 20 times, according to the following procedure.

(1) A lens set to 20 times, and a focal length is adjusted. The position of the nonwoven was adjusted so that 4×6 holes appeared.

(2) The brightness of the area of the hole was designated and the area of the hole was measured.

(3) Color extraction of "area measurement" clicking on "measurement, annotation". Click on a portion of the hole.

(4) Clicking 'summary measurement', selecting 'display measurement result window', and storing as CSV data.

"elongation" refers to the value when the natural length is set to 100%. For example, an elongation of 200% means the same as an elongation of 2 times.

"gel Strength" is determined as follows. To 49.0g of artificial urine (obtained by mixing urea: 2wt%, sodium chloride: 0.8wt%, calcium chloride dihydrate: 0.03wt%, magnesium sulfate heptahydrate: 0.08wt% and ion-exchanged water: 97.09 wt%), 1.0g of a super absorbent polymer was added and stirred by a stirrer. The resulting gel was allowed to stand in a 40 ℃ X60% RH constant temperature and humidity tank for 3 hours and then returned to normal temperature, and the gel strength was measured by a curd meter (manufactured by I.techno Engineering Co., ltd.: curdetter-MAX ME-500).

"weight per unit area" is determined as follows. After the sample or test piece was dried, it was placed in a laboratory or apparatus in a standard state (the temperature at the test site was 23.+ -. 1 ℃ C., and the relative humidity was 50.+ -. 2%) to make it a constant state. The preliminary drying means that the sample or test piece is kept constant at a temperature of 100 ℃. In addition, the fiber having a predetermined moisture regain of 0.0% may not be subjected to preliminary drying. A sample having a size of 100 mm. Times.100 mm was cut from a test piece in a constant state using a template (100 mm. Times.100 mm) for sample selection. The weight of the sample was measured and multiplied by 100 to calculate the weight per square meter as the weight per unit area.

"thickness" is measured using an automated thickness gauge (KES-G5 portable compression measurement procedure) under load: 0.098N/cm ² Area of pressurization: 2cm ² Is automatically determined under the condition of (2). The thickness of the perforated nonwoven fabric was measured at the holes and the surrounding portions thereof except for the protruding portions.

"Water absorption" was measured by JIS K7223-1996 "method of testing water absorption of superabsorbent resin".

"Water absorption Rate" is the time to endpoint when "Water absorption Rate test method of superabsorbent resin" of JIS K7224-1996 "was performed using 2g of superabsorbent polymer and 50g of physiological saline.

"expanded state" refers to a state in which the elastic member is not contracted (including all contracted due to contraction or the like) or is loosely and flatly expanded.

Unless otherwise specified, the dimensions of the respective portions refer to the dimensions in the expanded state rather than the natural long state.

"melt viscosity" is measured at a predetermined temperature in accordance with JIS Z8803 using a Brookfield type B viscometer (rotor No. 027).

The "maximum size" of the hole means the longer one of the MD-direction dimension and the CD-direction dimension.

"average friction coefficient MIU" and "variation deviation MMD of average friction coefficient" refer to values of 20mm of sensor movement distance measured using a friction sensor KES-SE (10 mm square silicone sensor, load 50 g) manufactured by KATO Tech Co. The direction of movement (rubbing direction) of the sensor is the MD direction of the top sheet. In the case of measuring a product, the components other than the top sheet in the product are removed or cut out (therefore, for example, the components welded to the top sheet are not removed) within a range that does not affect the friction test of the top sheet front surface, and the test is performed in the developed state.

When the CD dimension of the liquid containing region in the top sheet is smaller than the sensor dimension (10 mm), the top sheet 30 is cut along the side edges of the liquid containing region 32 as shown in fig. 13 (a), and a sample 300 (width smaller than the sensor 100) is produced which is only the liquid containing region 32, and the center of the sensor 100 is aligned with the CD center of the sample 300 as shown in fig. 13 (b) and measured. In addition, in each measurement, the hydrophilic agent liquid adhering to the surface of the sensor 100 is sufficiently wiped off, and then the next measurement is performed.

In addition, in the case where the liquid-containing region cannot be visually determined, the liquid-containing region can be determined by an appropriate method. For example, a sample having the same positions as the required number of the reagent-containing liquid regions 32 (for measurement and for position determination) may be prepared, the reagent-containing liquid regions 32 in the topsheet 30 of the sample for position determination may be colored with a suitable colorant to a color different from the surrounding, the colored positions may be determined by using a ruler or a suitable image measuring device, and then the same positions as the colored positions determined by the sample for position determination in the sample for measurement may be used as the reagent-containing liquid regions 32 to perform measurement. As a substance capable of coloring the region 32 containing the hydrophilic agent liquid, a water leakage developer (mounting W) of taset corporation can be suitably used. In the case of measuring the MD direction dimension 32L and the CD direction dimension 32W of the liquid containing region 32, and in the case of measuring the surface moisture ratio described later, the liquid containing region 32 may be determined by this method.

"surface moisture fraction" is an average value measured and calculated at any 3 points in the solution containing region 32 using a moisture detector (MY-808S) manufactured by Scalar corporation. In addition, at each measurement, the hydrophilic agent liquid adhering to the measurement surface of the moisture detector was sufficiently wiped off, and then the next measurement was performed.

The "water activity value" can be measured by a resistance water activity measuring device such as EZ-100ST (resistance type) manufactured by feRende industries, ltd. Before the measurement, correction was performed using a saturated solution. The determination may be made in accordance with a resistive test based on food sanitation inspection guidelines. That is, a sample having a volume amount of 3% or more of the volume of the space in the detector of the water activity measuring apparatus was collected, placed on an aluminum foil plate or an open flat plate, immediately sealed in the detector, and placed under a condition of 25±2 degrees, the values were read at intervals of 10 minutes, and the time point at which the fluctuation of the values was no longer observed was regarded as the equilibrium state of the vapor pressure in the detector, and the value at this time point was regarded as the measurement value of the sample. Each sample was measured 3 times, and the average value of the 3 measured values was used as the water activity value.

"viscosity" is measured at a prescribed temperature in accordance with JIS Z8803 using a Brookfield type B viscometer (rotor No. 027).

The test or measurement is carried out in a laboratory or in an apparatus in a standard state (temperature at the test site of 23.+ -. 1 ℃ C., relative humidity of 50.+ -. 2%) without any description of the environmental conditions of the test or measurement.

Industrial applicability

The present invention can be applied to all disposable wearing articles such as a pants-type disposable diaper and a belt-type disposable diaper, a pad-type disposable diaper, a disposable swimwear, a diaper cover, and a sanitary napkin.

Description of the reference numerals

11: a liquid-impermeable sheet; 12: outer non-woven fabrics; 20: a recessed portion; 30: a top sheet; 40: a middle sheet; 50: an absorbing member; 56: an absorber; 58: packaging the sheet; 60: standing up the pleats; 62: a pleat sheet; LD: a front-rear direction; WD: a width direction; 29: a hydrophobic hot melt adhesive; 31: a convex portion; 32: and a liquid-containing region.

Claims

1. A disposable wearing article, characterized in that,

the disposable wearing article comprises:

a topsheet comprising a skin contact area in contact with the skin of a wearer; and

a back side member adjacent to the back side of the top sheet,

The top sheet is a nonwoven fabric having liquid permeability,

the skin contact area has a liquid-containing area containing a hydrophilic agent liquid containing water,

on the back surface of the top sheet, concave parts concave toward the front surface side are arranged at intervals,

a gap is formed between the upper surface of the concave portion and the back side member,

the liquid-containing region has a portion overlapping the recess.

2. The disposable wearing article according to claim 1, wherein,

the liquid-containing region has a dimension in the front-rear direction of 30mm or more and a dimension in the width direction of 5mm or more,

the recessed portions have a front-rear direction dimension of 3mm to 8mm and a width direction dimension of 3mm to 5mm, and are arranged in the entirety of the skin contact region of the top sheet at a front-rear direction interval shorter than the front-rear direction dimension of the liquid containing region and a width direction interval shorter than the width direction dimension of the liquid containing region.

3. The disposable wearing article according to claim 1 or 2, wherein,

the top sheet has a fineness of 1 dtex-3 dtex and a weight of 10g/m per unit area ² ～30g/m ² And the thickness of the short fiber non-woven fabric is 0.4 mm-1.4 mm,

The recessed portion is formed on the back surface of the top sheet by embossing the top sheet by pressing from the back surface side toward the front surface side, and the convex portion protruding along the inner surface of the recessed portion is formed on the front surface of the top sheet, with a concave portion between adjacent convex portions on the front surface of the top sheet.

4. The disposable wearing article according to any one of claims 1 to 3, wherein,

the depth of the concave part is 0.5 mm-3 mm,

the dimension of the recess in the front-rear direction is longer than the shortest interval between the recesses adjacent in the front-rear direction,

the dimension of the recess in the width direction is longer than the shortest interval of the recesses adjacent in the width direction.

5. The disposable wearing article according to any one of claims 1 to 4, wherein,

the hydrophilic agent liquid contains 70 to 90 weight percent of glycerin and 10 to 30 weight percent of water,

in the solution-containing region, the content of the hydrophilic agent solution per unit area is 5g/m ² ～15g/m ² 。

6. The disposable wearing article according to any one of claims 1 to 5, wherein,

the hydrophilic agent liquid has a viscosity of 150 to 400 mPas at a temperature of 20 ℃.

7. The disposable wearing article according to any one of claims 1 to 6, wherein,

the nonwoven fabric is a hydrophilic fiber nonwoven fabric obtained by coating hydrophilic agent on the fibers of a hydrophobic resin.